SuSE 11.3 - man page for glactivetexturearb (suse section 3G)
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glActiveTextureARB - select active texture unit
void glActiveTextureARB( GLenum texture )
texture Specifies which texture unit to make active. The number of texture units is
implementation dependent, but must be at least two. texture must be one of
GL_TEXTURE$i$_ARB, where 0 <= $ i $ < GL_MAX_TEXTURE_UNITS_ARB, which is an
implementation-dependent value. The initial value is GL_TEXTURE0_ARB.
glActiveTextureARB selects which texture unit subsequent texture state calls will affect.
The number of texture units an implementation supports is implementation dependent, but
must be at least 2.
Vertex arrays are client-side GL resources, which are selected by the
glActiveTextureARB is only supported if GL_ARB_multitexture is included in the string
returned by glGetString when called with the argument GL_EXTENSIONS.
GL_INVALID_ENUM is generated if texture is not one of GL_TEXTURE$i$_ARB,
where 0 <= $ i $ < GL_MAX_TEXTURE_UNITS_ARB.
glClientActiveTextureARB(3G), glGetIntegerv(3G), glMultiTexCoordARB(3G),
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